Channel cracks in a hermetic coating consisting of organic and inorganic layers

Flexible electronic devices often require hermetic coatings that can withstand applied strains. This letter calculates the critical strains for various configurations of channel cracks in a coating consisting of organic and inorganic layers. The authors show that the coating can sustain the largest strain when the organic layer is of some intermediate thicknesses. (c) 2007 American Institute of Physics.